You've moved me a place of uncertainty here. I had some confirmation that _some_ browsers use box blurs for this effect, I _know_ some game engines use multiple

You've moved me a place of uncertainty here. I had some confirmation that _some_ browsers use box blurs for this effect, I _know_ some game engines use multiple box blurs to approximate Gaussian blur (having seen the code myself). I updated a few sentences in the article to reflect that uncertainty. Thanks!